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arXiv 2011.11556cond-mat.quant-gascond-mat.otherphysics.flu-dyn
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一维超流体中暗孤子气体的动力学理论

Towards a kinetic theory of a dark soliton gas in one-dimensional superfluids

C. Pereira, J. D. Rodrigues, J. T. Mendonça, H. Terças

摘要:

孤立子动力学是描述低维系统中强湍流的一个有力工具。准一维非线性流体(如玻色-爱因斯坦凝聚体)中的强湍流涉及到暗孤子的动力学,因此,描述暗孤子(即孤子气体)的统计系综是必要的。在这项工作中,我们提出了一个相空间(动力学)描述的暗孤子气体,引入一个动力学方程,这是形式上类似于等离子体物理中的弗拉索夫方程。我们表明,所提出的动力学理论可以捕获孤子气体的动力学特征,并表明它维持一个声学模式,一个事实,我们证实了直接数值模拟的帮助下。我们的发现激发了对低维超流体中非平衡和湍流区域微观结构的研究。

英文摘要:

Soliton hydrodynamics is an appealing tool to describe strong turbulence in low-dimensional systems. Strong turbulence in quasi-one dimensional spuerfluids, such as Bose-Einstein condensates, involves the dynamics of dark solitons and, therefore, the description of a statistical ensemble of dark-solitons, i.e. soliton gases, is necessary. In this work, we propose a phase-space (kinetic) description of dark-soliton gases, introducing a kinetic equation that is formally similar to the Vlasov equation in plasma physics. We show that the proposed kinetic theory can capture the dynamical features of soliton gases and show that it sustains an acoustic mode, a fact that we corroborate with the help of direct numerical simulations. Our findings motivate the investigation of the microscopic structure of out-of-equilibrium and turbulent regimes in low-dimensional superfluids.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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